Improvement in attaching propellers to driving-shafts



UNITED STATES PATENT OFFICE.

JALWIES L. CATHCART, OF WASHINGTON, DISTRICT OF COLUMBIA.

IMPROVEMENT lN ATTACHlNG PROPELLERS T0 DRlVlNG-SHAFTS.

Specification forming part of Letters Patent No. 10,790., dated April 18, 1854.

To a/ZZ whom it may concern:

Be it known that I, JAMEs L. CATHCART, of

the city of Washington, in the District of Columbia, have invented a new and Improved Manner otAttaching Propellers to Ships or Vessels' of all Classes; and I do hereby declare the following to be a full, clear, and exact description of the construction and operation of the same, reference being had to the annexed drawings, making a part of this specification, in which- Figure 1 is an elevation view of the stern, and Fig. 2 a longitudinal section.

A isthe driving-shaft inboard.

B is the driving-shatt outboard and passes through boxes in the rudder (when one is used.)

C is a universal joint by which the shafts A and B are united.

D D is the propeller.

E is the rudder.

F is the Stern-post.

G is the head, or that part of the rudder which passes through the rudder-case on deck.

H is the tiller, which is secured to the head of the rudder.

I is the wheel by which the vessel is steered.

K K are the pintels upon which the rudder is hung.

To enable others skilled in the art to make and use my invention, I will proceed to describe its construction and operation.

I make the driving-shaft of propellers in two pieces, united outboard by a universal joint, the outer or short piece of the shaft passing through boxes in the rudder and pro? jecting abaft the rudder a sufficent length to receive the propeller.

' By means of the universal joint the helmsman has control over the propeller as Well as the rudder, and is enabled to turn the vessel in a much smaller circle and With less helm than can be done with the rudder alone. I can also use the propeller as asteering apparatus without a rudder by hanging it on a swinging crane instead of a rudder and attaching the wheel-ropes to it.

What I claim as my invent-ion, and desire to secure by Letters Patent, is?H Attaching the propeller, secured to a short shaft which passes through the rudder, to its main or driving shaft by a universal joint placed between the Stern-post and the rudder, by which attachment the propeller is moved laterally With the movement ot' therudder.

JAMES L. CATHCART. Witnesses:

GEO. W. BRADFORD, WM. A. PAGE. 

